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Goodwill and Acquired Intangible Assets - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Segment
Dec. 31, 2012
Dec. 31, 2011
Oct. 02, 2012
Contingency Services [Member]
Goodwill And Intangible Assets [Line Items]        
Number of reportable segments 4      
Goodwill deemed to be impaired $ 0     $ 0
Number of year projections that reflect the anticipated cash flow fluctuations 5 years      
Residual value 0      
Amortization of acquired intangible assets 13,000,000 18,000,000 21,000,000  
2014 9,000,000      
2015 7,000,000      
2016 5,000,000      
2017 2,000,000      
2018 $ 2,000,000